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US Patent: 474,300
Pipe Wrench
Patentee:
George McKercher (exact or similar names) - Jonesville, MI

USPTO Classifications:
81/99

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
George McKercher - Jonesville, MI
Edward McKercher - Jonesville, MI
William S. Coleman - Jonesville, MI
Frank J. McEntee - Jonesville, MI

Manufacturer:
Unknown

Witnesses:
J. B. McGirr
William O. Belt
Chas. F. Wade
Wm. M. Wetmore

Patent Dates:
Applied: Dec. 15, 1891
Granted: May 03, 1892

Patent Pictures:
George McKercher patent May 3, 1892
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Description:
Self-adjusting hook jaw; the handle is comprised of two plates with the positioning spring and other parts sandwiched between them. Two alternate shapes are shown for the end of the hook jaw that contacts the spring. The positioning spring is shaped to form most of the handle perimeter.

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